Piston



E. C. LONG Dec. 31, 1929.

PISTON Filed March, 12, 1923 w I I I I lime/ 61i @iMM Patented Dec. 31, 1929 UNITED STATES PATENT OFFICE ELMER-C. LONG, 013 DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

SECURITY TRUST COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHI- GAN PISTON Application filed March 12, 1923. Serial No. 624,463.

The invention contained in this application is a furthering of the improvements and principles contained in my pending application for U. S. Letters Patent filed December adjacent separated portions which are oppo-.

sitely disposed therefrom. The aforesaid means being peculiarly disposed are designed so as to tend to reduce the diameter of the skirt portion of the piston when expanding forces are being given to the plston by the heated conditions contained within the cylinder of an internal combustion motor in which this improved piston is adapted to reciprocate.-

Another object of the invention is to provide supporting webs of the piston with radiating fins or members. I

, Other and further objects will appear in the specification and be specifically pointed.

out in the appended claims, reference being;

\ had to the accompanying drawings, exemplifying the invention, and in which Figure 1 is a vertical section taken through itsimproved piston on the line II of Fig. 2.

Figure 2 is avertical section taken approxi- -mately on the'line IIII of Fig. 1. s Figure 3 is an inverted view of Fig. 1

taken in the direction of the arrow 3.

Figure 4 is a horizontal section taken on the line IV-IV of Fig. 2.

llVith reference to the accompanying draw ings, this improved piston is provided witha closed end 1 and an open end 2 and adjacent the closed end 1 on the periphery of ,the piston is provided a serieskof packing ring recesses 3.

Depended from the closed end 1 within the piston are a series of reinforcing webs 4L and leading downwardly from each web and formed integral with opposite sides of the piston is a continuing web 5, said continuing webs on each side of the piston extending to and are formed integral with respective wrist pin bearings 6.

the thickness of the peripheral wall of the piston, said slotting extending nearly around the piston with the exception of the portion 8 on the back-slap-side 9 of the piston which is disposed at right angles to the wrist pin bearings 6, said slotting dividing the piston into a packing ring bearing portion 10 and a skirt portion 11.

The annular slotting 7 is disposed within the lowermost recess 12 for the reception of a packing ring 13.

Extending from the back-slap-side 9 of the piston is a pair of transversely disposed supporting webs 14, each of said webs being formed integral with the skirt portion of the piston and with one side of a respective Wrist pin bearing 6, each of said webs extending from the skirt portion of the piston to respective wrist pin bearings at an angle of approximately 45 degrees, as designated at 15. Each of the Webs 14 from their point of intersection with the wrist pin bearings is extended beneath' its respective'wrist pin bearings and are spaced apart from the wrist pin bearings,

as shown at 16, said webs continuing in their transverse disposition and are integrally connected at 17 to opposite sides of the skirt portion of the piston. Each of the webs 14;

is provided with a radiating fins 18.

From the disclosure of Figs. 1, 3 and 4 of the drawings, it is to be noted that the plurality of extending wrist pin bearings 6 while being depended within the skirt portion 11 of the piston, are

also suspended from the closed end 1, such inasmuch as the closed end 1 on account of be-' ing in direct contact with the explosive heat, it is only natural that the maximum amount of heat will be received and contained in said closed end, but on account of the annular slotting 7 which divides the skirt portion 11 from said closed end 1, the maximum amount of heat from the closed end 1 can not be trans ferred to the skirt portion, and consequently the same will tend to expand in diameter, but

on account of the-peculiar disposition of the supporting webs 14 which extend from the back-slap-side 9 of the piston to the adjacent separated parts 20 of the skirt portion provided by the slot 19, said webs will not permit the portions 20 to expand or move too far outwardly on account-of said portions 20 being anchored by the webs 14:, and on account of the angular portions 15 being disposed as they are, the extending portions of the webs 14 which engage the portions 20 of the skirt will tend to move inwardly towards each other as indicated by the lines 21 in Fig. 4 in which the portions 20 of the skirt portion will move towards closing the lengthwise arranged slot 19.

From the aforesaid description of this im proved invention, it is readily seen that the peripheral wall ofthe skirt portion of the piston is prevented from too tightly engaging the cylinder wall during extreme heated conditions of the cylinder.

For preventing horizontal displacement of the wrist pin 22 within the bearings 6 a set screw 23 is threadingly engaged within a boss 24 which is formed on one of said bearings,

.saidboss at its depending end being provided with a pair of notches 25 through which a cotter-key 26 is engaged'as it is being mounted in the opening 27 which is provided transversely through the outer end of the set screw 23. he set screw 23 is adapted to engage the wrist pin 22.

What I claim is 1. A piston comprising a head and a skirt and kin bosses, said skirt being provided with a slit which extends from a point near the head to the open end of the piston, said slit providing adjacent disconnected portions on one side of the skirt, and cooperating members extending from one side of a respective pin boss to opposite sides of the skirt and being free from engagement with, the lower sides of the pin bosses.

2. A piston open at one end and having a slot extending from the open end towards the closed end thereof, and means arranged within the piston and extending to the parts provided by the slot thereof whereby when the piston is subjected to heat the expansive forces thereof will contract the diameter of the skirt portion of the piston.

3. A. piston solid at one end and having the skirtportion thereof partially separated from the solid end, said skirt portion being provided with a slot extending from the open end so as to provide flexibility thereto, and means provided on said piston whereby said skirt portion tends to draw inwardly from the expanding portion of the piston.

4. A piston solid at one end and having the skirt portion thereof partially separated from the solid end, said skirt portion being slotted so as to provide flexibility thereof, a wrist pin bearing portion depended from said solid end, and means extending from said bearing to said skirt portion whereby when said wrist pin bearing is moved outwardly by expansion, the slotted portion of said skirt portion will tend to move inwardly.

5. A piston open at one end and having its peripheral wall slotted from its open end so as to provide flexibility thereto, a rigid portion formed interiorally of the piston separated from its peripheral wall, and means connecting saidrigid portion to said peripheral wall' for tending to draw a portion of said peripheral Wall inwardly.

6. A piston having a pair of wrist pin bear ings, which are separated from the peripheral wall of the skirt portion of the piston, said skirt portion also being partially separated from the solid end of the piston and bearing a longitudinally extending slot cut entire- 1y through'its peripheral-wall, and connecting means extending from each of said bear ing portions to said skirt portion, said connecting means providing means. for tending to close the slot of said skirt portion when the piston is subjected to expansion.

7 A piston having 'a pair of wrist pin bearings which are separated from the peripheral wall of the skirt portion of the piston, a slot cut entirely through the thickness of the peripheral wall of said skirt portion extending from the open end thereof, a pair of webs extending from one side of said skirt portion opposite to "said slot, each of said webs being formed integral with a respective wrist pm bearing and extending to the adjacent discon- 'nccted portions provided by said slot.

8. A piston having a pair of wrist pin bearings which are separated from the peripheral wall ofthe skirt portion of the piston, a slot cut entirely through the thickness of the peripheral wall of said skirt portion extending from the open end thereof, a pair of webs extending from one side of said skirt portion opposite to said slot, each of said webs being formedintegral with said skirt portion and a respective wrist pin bearing, said webs from their point of intersection with said wrist pin bearings extending beneath and away from the respective bearings with which they are' bearing and extendingto the adjacent disconi nected ortions provided by said slot, each of said we s being provided'witha plurality of projections. n

10. A piston closed at one end and open at its opposite end, said piston having a trans verse slot partially separating the closed end of the piston thereby providing a separated skirt portion to the piston, said skirt portion having a slot extending from its open end to said transverse slot, said slots being cut en.-

tirely through the thickness of the peripheral wall of the piston, a pair of webs extending from one side of said skirt ortion oppositeto said slot, each of said we s being formed integral with a respective wrist in bearing and extending to the adjacent sconnected portions provided by said slot, each of said webs being provided with a plurality of projections.

12. A piston comprising a head and a skirt,

said skirt being provided with a slit which extends from a point nearthe head to the open end of the piston, said slit providin adjacent disconnected portions on one side 0 the skirt, means co-operable with said disconnected portions extending from the opposite side of the skirt to each of the disconnected ortions, and

means forming apart on each 0 said extending means for determining the fulcrum point thereof.

13. A piston comprising a head and a skirt, said skirt being provided with a slit which extends from a point near the head to the open end of the piston, said slit providing adj acent disconnected portions onone side of the /slcirt, and a web extending from the opposite side of the skirt to each of the adjacent disconnected portions each being rovided with a bended portion adjacent the side of the skirt which is opposite to said slit, said bended portions each providing a fulcrum to a respective web;

11. A piston comprising a head and a skirt, said skirt being provided with a slit which said skirt being provided with a slit which extends from a point near the head to the open end of the piston, said slit providin adjacent disconnected portions on one side 0 the skirt, a pair of wrlst pin bearings, and a web extending from the opposite side of the skirt to each of the adjacent disconnected portions each being provided with means for determining the fulcrum point thereof, said webs being arranged on a plane below said bearings.

15. A piston comprising a head and a skirt, said skirt being provided with a slit which extends from a point near the head to the open end of the piston, said slit providin adjacent disconnected portions on one side 0? the skirt, a pair of wrist pin bearings depended from said head, and a web extending from the opposite side of the skirt to each of the adjacent disconnected portions and to one side of each of said bearings, said webs being ar vranged on. a plane below said bearings and --head being provided with a transverse slot, said skirt having a slit which extends from said slot to the open end of the piston, said slot and said slit providing adjacent disconnected portions on one side of the skirt, a pair of 'wrist pin bearings depended from said head being free from engagement with said skirt, and means active on said adjacent disconnected portions towards preventing said portions from moving outwardly extending from said portions to the opposite side of'the skirt.

17. A piston having a head portion and a sleeve-like skirt portion, said skirt portion being separated from said head portion by an annularly extending non-conducting gap, said skirt portion being slotted longitudinally from one end to the other, a pair of pin bosses located interiorly of said skirt'portion, and supporting means for said skirt portionextending from one side of said pin bosses to said skirt portion.

18. A piston closed at one end, a longitudinally slotted sleeve-like one-piece skirt separated fromsaid closed end, a pair of wrist pin bearings depended from said closed end within said skirt, and a web extending from each of said hearings to one side of said skirt, each of said webs having apart extending to the opposite side of the skirt beneath said bear' I a 19. i piston for an internal combustion motor comprising a head and a skirt and pin bosses, and a web extending from each pin boss to the skirt having a plurality of projeetions thereon. a

' 'ELMER C. LONdr; 

